Border Collies can't herd cats, but they can herd sheep like crazy. This is actually my favorite non-cat video for the day, extreme electric sheep herding in Wales.
Border Collies are smart. In fact, by many accounts they may be the smartest dog breed around. They do a great job herding sheep, but even though they might try, they can't herd cats, at least not without a fight. It takes real men (and real horses) to herd cats.
I've heard stories about Border Collies trying to herd everything in their path and everything not in their path, from children to cats. The cats don't usually appreciate this behavior, of course, and problems usually arise.
The content on cat-lovers-only.com is for education and information only. It should not be used as a substitute for professional veterinary advice, diagnosis, or treatment. For medical advice about your cat, please see your veterinarian.